The Siemens 3RF3330-1DA44 is a 1-pole SIRIUS 3RF33 solid-state contactor rated for 30 A in AC-1 (resistive) duty at 40 °C ambient. The load supply range is 48–460 V AC, and the control input accepts 4–30 V DC — a low-voltage DC coil equivalent that interfaces directly with PLC or safety relay outputs without an interposing relay.
Deployment context
The 1-pole form factor suits single-phase resistive loads (heaters, lighting) or DC switching where a single pole is sufficient. Packaged individually, dimensions 105 x 27 x 122 mm — fits a standard 22.5 mm wide modular contactor footprint. The low control voltage (4–30 V DC) allows direct drive from 24 V DC PLC outputs without a separate power supply.